Feed gas separation method and apparatus of coal gasification apparatus

Abstract

The invention relates to a separation system for separating carbon monoxide / hydrogen into a fluid for a downstream to serve as synthesis gas and separating liquefied methane (LNG) into another fluid for commercial sale in raw material gas which comes from a coal gasifier and comprises basic constituents of the carbon monoxide, the hydrogen and methane. The separation system adopts a double tower flow of a scrubbing tower and a CH4-CO rectifying tower, and most of raw material synthesis gas is scrubbed and then forms the synthesis gas with the content of the methane lower than 1 percent at the tower top in reasonably controlling the reflux ratio; and a liquid phase after the scrubbing is sent into the CH4-CO rectifying tower, and separated CH4 is liquefied into the LNG. The CH4-CO rectifying tower has small flow, reduces 10 percent of separation power consumption compared with a single tower flow, and can also reduce the number of tower plates, so the double tower flow reduces the height of the tower, saves cost, and also ensures that the raw material synthesis gas has smallest resistance consumption to the synthesis gas. The separation system has the advantages of a small discharge amount of waste gas, environmental protection, and energy conservation, and has good economic benefit and social benefit.

Description

technical field [0001] The invention relates to a method and device for separating raw material gas from a coal gasification device. Background technique [0002] At present, the raw material gas from the coal gasification unit of the chemical plant is basically composed of CO and CH 4 、H 2 , due to the methane gas CH 4 The existence of ammonia is very unfavorable to the synthesis of ammonia or methanol from raw material gas, which affects the synthesis rate of products and increases energy consumption. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method and device for separating raw material gas from a coal gasification device that can effectively separate and utilize methane gas, and has the characteristics of environmental protection, energy saving and low cost. [0004] In order to solve the above technical problems, the method for separating raw material gas from a coal gasification device of the pre...

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Problems solved by technology

[0002] At present, the raw material gas from the coal gasification unit of the chemical plant is basically composed of CO and CH 4 、H 2 , due to the methane gas CH 4 The existence of it is very unfavorable to the synthesis of ammonia or methanol by using raw material gas, affecting the synthesis rate of products and increasing energy consumption

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